Molybdenum emission from impurity-induced snakes on Alcator C-Mod

The Measurement of the Intrinsic Impurities of Molybdenum and Carbon in the Alcator C-Mod Tokamak Plasma using Low Resolution Spectroscopy

The intrinsic impurity content of molybdenum and carbon was measured in the Alcator C-Mod Tokamak using low resolution, multilayer mirror (MLM) spectroscopy (∆λ ~ 1-10 Å). Molybdenum was the dominant high-Z impurity and originated from the molybdenum armor tiles covering all of C-Mod's plasma facing surfaces (including the inner column, the poloidal divertor plates, and the ICRF limiter). Despi...

Formation, stability and momentum transport characteristics of impurity-induced snakes in Alcator C-Mod

Nonlinear neoclassical transport in a rotating impure plasma with large gradients

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PFC / JA - 94 - 012 Plasma - Surface Interactions in the Alcator C - Mod Tokamak

Alcator C-Mod is a high-field tokamak with which experiments were initiated in April 1993. The divertor and the first-wall have plasma-facing surfaces of molybdenum. The divertor has a configuration which is closed in comparison to other, currently operating tokamaks. The combination of divertor geometry and high field (density) make Alcator C-Mod an ideal experiment to investigate dissipative ...

Poloidal variation of high-Z impurity density due to hydrogen minority ICRH on Alcator C-Mod

In the Alcator C-Mod tokamak, strong, steady-state variations of molybdenum density within a flux surface are routinely observed in plasmas using hydrogen minority ion cyclotron resonant heating. In/out asymmetries, up to a factor of 2, occur with both inboard and outboard accumulation depending on the major radius of the minority resonance layer. These poloidal variations can be attributed to ...